ELTRN-101A: Electronics DVC w/ T. Chatagnier Chp. 1-2
Terms
undefined, object
copy deck
- Engineering Notation
- A system for representing any number as a one, two, or three-digit number times a power of ten with an exponent that is a multiple of 3
- SI
- Standardized internationalized system of units used for all engineering and scientific work.
-
SI fundamental units and symbols
(7)
which necessary for this class -
Length Meter m
Mass kilogram kg
Time second s
Electric current Ampere A
Temp Kelvin K
Luminous intensity Candela cd
Amount of substance Mole mol -
SI supplemental units and symbols
(2) -
Plane angle Radian r
Solid angle Steradian sr -
Electrical quantities w/ derived units and symbols
(7 for this class)
bonus: name top 3 -
Charge Q Coulomb C
Conductance G Siemens S
Energy W Joule J
Frequency f Hertz Hz
Power P Watt W
Resistance R Ohm Ω
Voltage V Volt V -
Metric Prefixes w/ symbol, power of ten
(9) -
femto f -15
pico p -12
nano n -9
micro u(ish) -6
milli m -3
kilo k 3
mega M 6
giga G 9
tera T 12 -
femto
(symbol and power/place) -
f -15
nano pico femto (+ to -)
femto pico nano (- to +) -
pico
(symbol and power/place) -
p -12
micro nano pico femto (+ to -)
femto pico nano micro (- to +) -
nano
(symbol and power/place) -
n -9
micro nano pico (+ to -)
pico nano micro (- to +) -
micro
(symbol and power/place) -
u(ish) -6
milli micro nano (+ to -)
nano micro milli (- to +) -
milli
(symbol and power/place) -
m -3
kilo ___ milli micro (+ to -)
nano micro milli (- to +) -
kilo
(symbol and power/place) -
k 3
mega kilo ____ (+ to -)
milli ____ kilo (- to +) -
mega
(symbol and power/place) -
M 6
giga mega kilo (+ to -)
____ kilo mega (- to +) -
giga
(symbol and power/place) -
G 9
tera giga mega (+ to -)
kilo mega giga (- to +) -
tera
(symbol and power/place) -
T 12
tera giga mega (- to +)
kilo mega giga..(+ to -) - Valence shell
- The outermost shell of an atom. Electrons in this shell are the valence electrons.
- Free electron
- An electron that has absorbed a photon with sufficient energy to escape from the atom.
- Ion
- When an atom or group of atoms is left with a net charge.
- Coulomb
- The unit of charge. Electrical charge (Q) measured in coulombs, symbolized by C. 6.25 X 10 (18th).
- Voltage
- The difference in potential energy per charge is the potential difference.
- Current
- The movement of electrons.
- Ampere
- (A) the amount of current that exists when a number of electrons having a total charge of one coulomb (1C) move through a given cross-sectional area in on second.
- Resistance
- The opposition to current. Expressed in ohms (Ω)
- Semiconductors have x elctrons in their valence shell.
- 4 electons in valence shell.
- Series-connected batteries
- the positive electrode of one cell is connected to the negative electrode of the next and so on.
- Parallel-connected battery
- the positive electrodes of several cells are connected together and all the negative electodes are conncected together. Increases battery capacity.
- A generator converts...
- ...mechanical energy into electrical energy using electromagnetic induction.
- A motor converts...
- ...electrical energy into mechanical energy.
- Three things necessary to make a generator, alternator, or a motor work.
-
Wire
Magnetic Field
Motion - Resistor size does not...
- ...determine resistance value, only how much heat it can get rid of.
- Decode a 4 band resistor
-
1st - first digit
2nd - second digit
3rd - number of zeros
4th - percent tolerance - Resistor color codes 0 - 4
-
black
brown
red
orange
yellow - Resistor color codes 5 - 9
-
green
blue
violet
gray
white - Resistor tolerance colors and values
-
gold - plus or minus 5%
silver - plus or minus 10% - Third band special multiplier: gold
-
multiply the first two-digit result by 0.1
XY x 0.1 = X.Y - Third band special multiplier: silver
-
Multiply the first two-digit result by 0.01.
XY x .01 = .XY - continued
- chapter 2
- Voltage =
- W/Q energy divided by charge(where W is expressed by joules)
- I (current)
- Q/t current equals charge divided by time
- G (conductance)
- 1/R Conductance is reciprocal of resistance
- Thermistor
- Type of variable resistor that is temperature sensitive
- Negative thermistor
- resistance chrge inversely with temperature change
- Positive thermistor
- resistance change directly with temperature change
- Load
- an element connected across the output terminals of a circuit that draws current from the source and upon which work is done
- SPST
- single post single throw switch
- DPDT
- double post double throw
- AWG
- American Wire Gauge
- Circular mil
-
a unit of cross-sectional area used for wires
CM - 1CM
- wire with diameter of .001 inch